Comparison analysis of the flow characteristics inside pump was performed in this study using Computational Fluid Dynamics (CFD) by changing the working fluid temperature and swash plate angle to reduce pulsation and to improve efficiency of pump. Analysis subjects are divided into Notch Applied Model and Notch Unapplied Model, and Swash Plate Angle of 16.3? and 8?. Cylinder revolution speed was set to 1,500 rpm for all cases. Numerical analysis was performed with 40? and 100? of working fluid temperature. As a result, it was found that average discharge flow rate is high and pulsation amplitude is low for all cases when working fluid temperature is 40?.